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f5db4af4 JB |
1 | /* |
2 | * Copyright (C) 2006-2009 Red Hat, Inc. | |
3 | * | |
4 | * This file is released under the LGPL. | |
5 | */ | |
6 | ||
7 | #include <linux/bio.h> | |
8 | #include <linux/dm-dirty-log.h> | |
9 | #include <linux/device-mapper.h> | |
10 | #include <linux/dm-log-userspace.h> | |
11 | ||
12 | #include "dm-log-userspace-transfer.h" | |
13 | ||
14 | struct flush_entry { | |
15 | int type; | |
16 | region_t region; | |
17 | struct list_head list; | |
18 | }; | |
19 | ||
20 | struct log_c { | |
21 | struct dm_target *ti; | |
22 | uint32_t region_size; | |
23 | region_t region_count; | |
7ec23d50 | 24 | uint64_t luid; |
f5db4af4 JB |
25 | char uuid[DM_UUID_LEN]; |
26 | ||
27 | char *usr_argv_str; | |
28 | uint32_t usr_argc; | |
29 | ||
30 | /* | |
31 | * in_sync_hint gets set when doing is_remote_recovering. It | |
32 | * represents the first region that needs recovery. IOW, the | |
33 | * first zero bit of sync_bits. This can be useful for to limit | |
34 | * traffic for calls like is_remote_recovering and get_resync_work, | |
35 | * but be take care in its use for anything else. | |
36 | */ | |
37 | uint64_t in_sync_hint; | |
38 | ||
39 | spinlock_t flush_lock; | |
40 | struct list_head flush_list; /* only for clear and mark requests */ | |
41 | }; | |
42 | ||
43 | static mempool_t *flush_entry_pool; | |
44 | ||
45 | static void *flush_entry_alloc(gfp_t gfp_mask, void *pool_data) | |
46 | { | |
47 | return kmalloc(sizeof(struct flush_entry), gfp_mask); | |
48 | } | |
49 | ||
50 | static void flush_entry_free(void *element, void *pool_data) | |
51 | { | |
52 | kfree(element); | |
53 | } | |
54 | ||
55 | static int userspace_do_request(struct log_c *lc, const char *uuid, | |
56 | int request_type, char *data, size_t data_size, | |
57 | char *rdata, size_t *rdata_size) | |
58 | { | |
59 | int r; | |
60 | ||
61 | /* | |
62 | * If the server isn't there, -ESRCH is returned, | |
63 | * and we must keep trying until the server is | |
64 | * restored. | |
65 | */ | |
66 | retry: | |
7ec23d50 | 67 | r = dm_consult_userspace(uuid, lc->luid, request_type, data, |
f5db4af4 JB |
68 | data_size, rdata, rdata_size); |
69 | ||
70 | if (r != -ESRCH) | |
71 | return r; | |
72 | ||
73 | DMERR(" Userspace log server not found."); | |
74 | while (1) { | |
75 | set_current_state(TASK_INTERRUPTIBLE); | |
76 | schedule_timeout(2*HZ); | |
77 | DMWARN("Attempting to contact userspace log server..."); | |
7ec23d50 JB |
78 | r = dm_consult_userspace(uuid, lc->luid, DM_ULOG_CTR, |
79 | lc->usr_argv_str, | |
f5db4af4 JB |
80 | strlen(lc->usr_argv_str) + 1, |
81 | NULL, NULL); | |
82 | if (!r) | |
83 | break; | |
84 | } | |
85 | DMINFO("Reconnected to userspace log server... DM_ULOG_CTR complete"); | |
7ec23d50 | 86 | r = dm_consult_userspace(uuid, lc->luid, DM_ULOG_RESUME, NULL, |
f5db4af4 JB |
87 | 0, NULL, NULL); |
88 | if (!r) | |
89 | goto retry; | |
90 | ||
91 | DMERR("Error trying to resume userspace log: %d", r); | |
92 | ||
93 | return -ESRCH; | |
94 | } | |
95 | ||
96 | static int build_constructor_string(struct dm_target *ti, | |
97 | unsigned argc, char **argv, | |
98 | char **ctr_str) | |
99 | { | |
100 | int i, str_size; | |
101 | char *str = NULL; | |
102 | ||
103 | *ctr_str = NULL; | |
104 | ||
105 | for (i = 0, str_size = 0; i < argc; i++) | |
106 | str_size += strlen(argv[i]) + 1; /* +1 for space between args */ | |
107 | ||
108 | str_size += 20; /* Max number of chars in a printed u64 number */ | |
109 | ||
110 | str = kzalloc(str_size, GFP_KERNEL); | |
111 | if (!str) { | |
112 | DMWARN("Unable to allocate memory for constructor string"); | |
113 | return -ENOMEM; | |
114 | } | |
115 | ||
b8313b6d JB |
116 | str_size = sprintf(str, "%llu", (unsigned long long)ti->len); |
117 | for (i = 0; i < argc; i++) | |
118 | str_size += sprintf(str + str_size, " %s", argv[i]); | |
f5db4af4 JB |
119 | |
120 | *ctr_str = str; | |
121 | return str_size; | |
122 | } | |
123 | ||
124 | /* | |
125 | * userspace_ctr | |
126 | * | |
127 | * argv contains: | |
128 | * <UUID> <other args> | |
129 | * Where 'other args' is the userspace implementation specific log | |
130 | * arguments. An example might be: | |
131 | * <UUID> clustered_disk <arg count> <log dev> <region_size> [[no]sync] | |
132 | * | |
133 | * So, this module will strip off the <UUID> for identification purposes | |
134 | * when communicating with userspace about a log; but will pass on everything | |
135 | * else. | |
136 | */ | |
137 | static int userspace_ctr(struct dm_dirty_log *log, struct dm_target *ti, | |
138 | unsigned argc, char **argv) | |
139 | { | |
140 | int r = 0; | |
141 | int str_size; | |
142 | char *ctr_str = NULL; | |
143 | struct log_c *lc = NULL; | |
144 | uint64_t rdata; | |
145 | size_t rdata_size = sizeof(rdata); | |
146 | ||
147 | if (argc < 3) { | |
148 | DMWARN("Too few arguments to userspace dirty log"); | |
149 | return -EINVAL; | |
150 | } | |
151 | ||
152 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); | |
153 | if (!lc) { | |
154 | DMWARN("Unable to allocate userspace log context."); | |
155 | return -ENOMEM; | |
156 | } | |
157 | ||
7ec23d50 JB |
158 | /* The ptr value is sufficient for local unique id */ |
159 | lc->luid = (uint64_t)lc; | |
160 | ||
f5db4af4 JB |
161 | lc->ti = ti; |
162 | ||
163 | if (strlen(argv[0]) > (DM_UUID_LEN - 1)) { | |
164 | DMWARN("UUID argument too long."); | |
165 | kfree(lc); | |
166 | return -EINVAL; | |
167 | } | |
168 | ||
169 | strncpy(lc->uuid, argv[0], DM_UUID_LEN); | |
170 | spin_lock_init(&lc->flush_lock); | |
171 | INIT_LIST_HEAD(&lc->flush_list); | |
172 | ||
173 | str_size = build_constructor_string(ti, argc - 1, argv + 1, &ctr_str); | |
174 | if (str_size < 0) { | |
175 | kfree(lc); | |
176 | return str_size; | |
177 | } | |
178 | ||
179 | /* Send table string */ | |
7ec23d50 | 180 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_CTR, |
f5db4af4 JB |
181 | ctr_str, str_size, NULL, NULL); |
182 | ||
183 | if (r == -ESRCH) { | |
184 | DMERR("Userspace log server not found"); | |
185 | goto out; | |
186 | } | |
187 | ||
188 | /* Since the region size does not change, get it now */ | |
189 | rdata_size = sizeof(rdata); | |
7ec23d50 | 190 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_GET_REGION_SIZE, |
f5db4af4 JB |
191 | NULL, 0, (char *)&rdata, &rdata_size); |
192 | ||
193 | if (r) { | |
194 | DMERR("Failed to get region size of dirty log"); | |
195 | goto out; | |
196 | } | |
197 | ||
198 | lc->region_size = (uint32_t)rdata; | |
199 | lc->region_count = dm_sector_div_up(ti->len, lc->region_size); | |
200 | ||
201 | out: | |
202 | if (r) { | |
203 | kfree(lc); | |
204 | kfree(ctr_str); | |
205 | } else { | |
206 | lc->usr_argv_str = ctr_str; | |
207 | lc->usr_argc = argc; | |
208 | log->context = lc; | |
209 | } | |
210 | ||
211 | return r; | |
212 | } | |
213 | ||
214 | static void userspace_dtr(struct dm_dirty_log *log) | |
215 | { | |
216 | int r; | |
217 | struct log_c *lc = log->context; | |
218 | ||
7ec23d50 | 219 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_DTR, |
f5db4af4 JB |
220 | NULL, 0, |
221 | NULL, NULL); | |
222 | ||
223 | kfree(lc->usr_argv_str); | |
224 | kfree(lc); | |
225 | ||
226 | return; | |
227 | } | |
228 | ||
229 | static int userspace_presuspend(struct dm_dirty_log *log) | |
230 | { | |
231 | int r; | |
232 | struct log_c *lc = log->context; | |
233 | ||
7ec23d50 | 234 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_PRESUSPEND, |
f5db4af4 JB |
235 | NULL, 0, |
236 | NULL, NULL); | |
237 | ||
238 | return r; | |
239 | } | |
240 | ||
241 | static int userspace_postsuspend(struct dm_dirty_log *log) | |
242 | { | |
243 | int r; | |
244 | struct log_c *lc = log->context; | |
245 | ||
7ec23d50 | 246 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_POSTSUSPEND, |
f5db4af4 JB |
247 | NULL, 0, |
248 | NULL, NULL); | |
249 | ||
250 | return r; | |
251 | } | |
252 | ||
253 | static int userspace_resume(struct dm_dirty_log *log) | |
254 | { | |
255 | int r; | |
256 | struct log_c *lc = log->context; | |
257 | ||
258 | lc->in_sync_hint = 0; | |
7ec23d50 | 259 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_RESUME, |
f5db4af4 JB |
260 | NULL, 0, |
261 | NULL, NULL); | |
262 | ||
263 | return r; | |
264 | } | |
265 | ||
266 | static uint32_t userspace_get_region_size(struct dm_dirty_log *log) | |
267 | { | |
268 | struct log_c *lc = log->context; | |
269 | ||
270 | return lc->region_size; | |
271 | } | |
272 | ||
273 | /* | |
274 | * userspace_is_clean | |
275 | * | |
276 | * Check whether a region is clean. If there is any sort of | |
277 | * failure when consulting the server, we return not clean. | |
278 | * | |
279 | * Returns: 1 if clean, 0 otherwise | |
280 | */ | |
281 | static int userspace_is_clean(struct dm_dirty_log *log, region_t region) | |
282 | { | |
283 | int r; | |
284 | uint64_t region64 = (uint64_t)region; | |
285 | int64_t is_clean; | |
286 | size_t rdata_size; | |
287 | struct log_c *lc = log->context; | |
288 | ||
289 | rdata_size = sizeof(is_clean); | |
290 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_IS_CLEAN, | |
291 | (char *)®ion64, sizeof(region64), | |
292 | (char *)&is_clean, &rdata_size); | |
293 | ||
294 | return (r) ? 0 : (int)is_clean; | |
295 | } | |
296 | ||
297 | /* | |
298 | * userspace_in_sync | |
299 | * | |
300 | * Check if the region is in-sync. If there is any sort | |
301 | * of failure when consulting the server, we assume that | |
302 | * the region is not in sync. | |
303 | * | |
304 | * If 'can_block' is set, return immediately | |
305 | * | |
306 | * Returns: 1 if in-sync, 0 if not-in-sync, -EWOULDBLOCK | |
307 | */ | |
308 | static int userspace_in_sync(struct dm_dirty_log *log, region_t region, | |
309 | int can_block) | |
310 | { | |
311 | int r; | |
312 | uint64_t region64 = region; | |
313 | int64_t in_sync; | |
314 | size_t rdata_size; | |
315 | struct log_c *lc = log->context; | |
316 | ||
317 | /* | |
318 | * We can never respond directly - even if in_sync_hint is | |
319 | * set. This is because another machine could see a device | |
320 | * failure and mark the region out-of-sync. If we don't go | |
321 | * to userspace to ask, we might think the region is in-sync | |
322 | * and allow a read to pick up data that is stale. (This is | |
323 | * very unlikely if a device actually fails; but it is very | |
324 | * likely if a connection to one device from one machine fails.) | |
325 | * | |
326 | * There still might be a problem if the mirror caches the region | |
327 | * state as in-sync... but then this call would not be made. So, | |
328 | * that is a mirror problem. | |
329 | */ | |
330 | if (!can_block) | |
331 | return -EWOULDBLOCK; | |
332 | ||
333 | rdata_size = sizeof(in_sync); | |
334 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_IN_SYNC, | |
335 | (char *)®ion64, sizeof(region64), | |
336 | (char *)&in_sync, &rdata_size); | |
337 | return (r) ? 0 : (int)in_sync; | |
338 | } | |
339 | ||
340 | /* | |
341 | * userspace_flush | |
342 | * | |
343 | * This function is ok to block. | |
344 | * The flush happens in two stages. First, it sends all | |
345 | * clear/mark requests that are on the list. Then it | |
346 | * tells the server to commit them. This gives the | |
347 | * server a chance to optimise the commit, instead of | |
348 | * doing it for every request. | |
349 | * | |
350 | * Additionally, we could implement another thread that | |
351 | * sends the requests up to the server - reducing the | |
352 | * load on flush. Then the flush would have less in | |
353 | * the list and be responsible for the finishing commit. | |
354 | * | |
355 | * Returns: 0 on success, < 0 on failure | |
356 | */ | |
357 | static int userspace_flush(struct dm_dirty_log *log) | |
358 | { | |
359 | int r = 0; | |
360 | unsigned long flags; | |
361 | struct log_c *lc = log->context; | |
362 | LIST_HEAD(flush_list); | |
363 | struct flush_entry *fe, *tmp_fe; | |
364 | ||
365 | spin_lock_irqsave(&lc->flush_lock, flags); | |
366 | list_splice_init(&lc->flush_list, &flush_list); | |
367 | spin_unlock_irqrestore(&lc->flush_lock, flags); | |
368 | ||
369 | if (list_empty(&flush_list)) | |
370 | return 0; | |
371 | ||
372 | /* | |
373 | * FIXME: Count up requests, group request types, | |
374 | * allocate memory to stick all requests in and | |
375 | * send to server in one go. Failing the allocation, | |
376 | * do it one by one. | |
377 | */ | |
378 | ||
379 | list_for_each_entry(fe, &flush_list, list) { | |
380 | r = userspace_do_request(lc, lc->uuid, fe->type, | |
381 | (char *)&fe->region, | |
382 | sizeof(fe->region), | |
383 | NULL, NULL); | |
384 | if (r) | |
385 | goto fail; | |
386 | } | |
387 | ||
388 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_FLUSH, | |
389 | NULL, 0, NULL, NULL); | |
390 | ||
391 | fail: | |
392 | /* | |
393 | * We can safely remove these entries, even if failure. | |
394 | * Calling code will receive an error and will know that | |
395 | * the log facility has failed. | |
396 | */ | |
397 | list_for_each_entry_safe(fe, tmp_fe, &flush_list, list) { | |
398 | list_del(&fe->list); | |
399 | mempool_free(fe, flush_entry_pool); | |
400 | } | |
401 | ||
402 | if (r) | |
403 | dm_table_event(lc->ti->table); | |
404 | ||
405 | return r; | |
406 | } | |
407 | ||
408 | /* | |
409 | * userspace_mark_region | |
410 | * | |
411 | * This function should avoid blocking unless absolutely required. | |
412 | * (Memory allocation is valid for blocking.) | |
413 | */ | |
414 | static void userspace_mark_region(struct dm_dirty_log *log, region_t region) | |
415 | { | |
416 | unsigned long flags; | |
417 | struct log_c *lc = log->context; | |
418 | struct flush_entry *fe; | |
419 | ||
420 | /* Wait for an allocation, but _never_ fail */ | |
421 | fe = mempool_alloc(flush_entry_pool, GFP_NOIO); | |
422 | BUG_ON(!fe); | |
423 | ||
424 | spin_lock_irqsave(&lc->flush_lock, flags); | |
425 | fe->type = DM_ULOG_MARK_REGION; | |
426 | fe->region = region; | |
427 | list_add(&fe->list, &lc->flush_list); | |
428 | spin_unlock_irqrestore(&lc->flush_lock, flags); | |
429 | ||
430 | return; | |
431 | } | |
432 | ||
433 | /* | |
434 | * userspace_clear_region | |
435 | * | |
436 | * This function must not block. | |
437 | * So, the alloc can't block. In the worst case, it is ok to | |
438 | * fail. It would simply mean we can't clear the region. | |
439 | * Does nothing to current sync context, but does mean | |
440 | * the region will be re-sync'ed on a reload of the mirror | |
441 | * even though it is in-sync. | |
442 | */ | |
443 | static void userspace_clear_region(struct dm_dirty_log *log, region_t region) | |
444 | { | |
445 | unsigned long flags; | |
446 | struct log_c *lc = log->context; | |
447 | struct flush_entry *fe; | |
448 | ||
449 | /* | |
450 | * If we fail to allocate, we skip the clearing of | |
451 | * the region. This doesn't hurt us in any way, except | |
452 | * to cause the region to be resync'ed when the | |
453 | * device is activated next time. | |
454 | */ | |
455 | fe = mempool_alloc(flush_entry_pool, GFP_ATOMIC); | |
456 | if (!fe) { | |
457 | DMERR("Failed to allocate memory to clear region."); | |
458 | return; | |
459 | } | |
460 | ||
461 | spin_lock_irqsave(&lc->flush_lock, flags); | |
462 | fe->type = DM_ULOG_CLEAR_REGION; | |
463 | fe->region = region; | |
464 | list_add(&fe->list, &lc->flush_list); | |
465 | spin_unlock_irqrestore(&lc->flush_lock, flags); | |
466 | ||
467 | return; | |
468 | } | |
469 | ||
470 | /* | |
471 | * userspace_get_resync_work | |
472 | * | |
473 | * Get a region that needs recovery. It is valid to return | |
474 | * an error for this function. | |
475 | * | |
476 | * Returns: 1 if region filled, 0 if no work, <0 on error | |
477 | */ | |
478 | static int userspace_get_resync_work(struct dm_dirty_log *log, region_t *region) | |
479 | { | |
480 | int r; | |
481 | size_t rdata_size; | |
482 | struct log_c *lc = log->context; | |
483 | struct { | |
484 | int64_t i; /* 64-bit for mix arch compatibility */ | |
485 | region_t r; | |
486 | } pkg; | |
487 | ||
488 | if (lc->in_sync_hint >= lc->region_count) | |
489 | return 0; | |
490 | ||
491 | rdata_size = sizeof(pkg); | |
492 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_GET_RESYNC_WORK, | |
493 | NULL, 0, | |
494 | (char *)&pkg, &rdata_size); | |
495 | ||
496 | *region = pkg.r; | |
497 | return (r) ? r : (int)pkg.i; | |
498 | } | |
499 | ||
500 | /* | |
501 | * userspace_set_region_sync | |
502 | * | |
503 | * Set the sync status of a given region. This function | |
504 | * must not fail. | |
505 | */ | |
506 | static void userspace_set_region_sync(struct dm_dirty_log *log, | |
507 | region_t region, int in_sync) | |
508 | { | |
509 | int r; | |
510 | struct log_c *lc = log->context; | |
511 | struct { | |
512 | region_t r; | |
513 | int64_t i; | |
514 | } pkg; | |
515 | ||
516 | pkg.r = region; | |
517 | pkg.i = (int64_t)in_sync; | |
518 | ||
519 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_SET_REGION_SYNC, | |
520 | (char *)&pkg, sizeof(pkg), | |
521 | NULL, NULL); | |
522 | ||
523 | /* | |
524 | * It would be nice to be able to report failures. | |
525 | * However, it is easy emough to detect and resolve. | |
526 | */ | |
527 | return; | |
528 | } | |
529 | ||
530 | /* | |
531 | * userspace_get_sync_count | |
532 | * | |
533 | * If there is any sort of failure when consulting the server, | |
534 | * we assume that the sync count is zero. | |
535 | * | |
536 | * Returns: sync count on success, 0 on failure | |
537 | */ | |
538 | static region_t userspace_get_sync_count(struct dm_dirty_log *log) | |
539 | { | |
540 | int r; | |
541 | size_t rdata_size; | |
542 | uint64_t sync_count; | |
543 | struct log_c *lc = log->context; | |
544 | ||
545 | rdata_size = sizeof(sync_count); | |
546 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_GET_SYNC_COUNT, | |
547 | NULL, 0, | |
548 | (char *)&sync_count, &rdata_size); | |
549 | ||
550 | if (r) | |
551 | return 0; | |
552 | ||
553 | if (sync_count >= lc->region_count) | |
554 | lc->in_sync_hint = lc->region_count; | |
555 | ||
556 | return (region_t)sync_count; | |
557 | } | |
558 | ||
559 | /* | |
560 | * userspace_status | |
561 | * | |
562 | * Returns: amount of space consumed | |
563 | */ | |
564 | static int userspace_status(struct dm_dirty_log *log, status_type_t status_type, | |
565 | char *result, unsigned maxlen) | |
566 | { | |
567 | int r = 0; | |
b8313b6d | 568 | char *table_args; |
f5db4af4 JB |
569 | size_t sz = (size_t)maxlen; |
570 | struct log_c *lc = log->context; | |
571 | ||
572 | switch (status_type) { | |
573 | case STATUSTYPE_INFO: | |
574 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_STATUS_INFO, | |
575 | NULL, 0, | |
576 | result, &sz); | |
577 | ||
578 | if (r) { | |
579 | sz = 0; | |
580 | DMEMIT("%s 1 COM_FAILURE", log->type->name); | |
581 | } | |
582 | break; | |
583 | case STATUSTYPE_TABLE: | |
584 | sz = 0; | |
0d03d59d | 585 | table_args = strchr(lc->usr_argv_str, ' '); |
b8313b6d JB |
586 | BUG_ON(!table_args); /* There will always be a ' ' */ |
587 | table_args++; | |
588 | ||
589 | DMEMIT("%s %u %s %s ", log->type->name, lc->usr_argc, | |
590 | lc->uuid, table_args); | |
f5db4af4 JB |
591 | break; |
592 | } | |
593 | return (r) ? 0 : (int)sz; | |
594 | } | |
595 | ||
596 | /* | |
597 | * userspace_is_remote_recovering | |
598 | * | |
599 | * Returns: 1 if region recovering, 0 otherwise | |
600 | */ | |
601 | static int userspace_is_remote_recovering(struct dm_dirty_log *log, | |
602 | region_t region) | |
603 | { | |
604 | int r; | |
605 | uint64_t region64 = region; | |
606 | struct log_c *lc = log->context; | |
607 | static unsigned long long limit; | |
608 | struct { | |
609 | int64_t is_recovering; | |
610 | uint64_t in_sync_hint; | |
611 | } pkg; | |
612 | size_t rdata_size = sizeof(pkg); | |
613 | ||
614 | /* | |
615 | * Once the mirror has been reported to be in-sync, | |
616 | * it will never again ask for recovery work. So, | |
617 | * we can safely say there is not a remote machine | |
618 | * recovering if the device is in-sync. (in_sync_hint | |
619 | * must be reset at resume time.) | |
620 | */ | |
621 | if (region < lc->in_sync_hint) | |
622 | return 0; | |
623 | else if (jiffies < limit) | |
624 | return 1; | |
625 | ||
626 | limit = jiffies + (HZ / 4); | |
627 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_IS_REMOTE_RECOVERING, | |
628 | (char *)®ion64, sizeof(region64), | |
629 | (char *)&pkg, &rdata_size); | |
630 | if (r) | |
631 | return 1; | |
632 | ||
633 | lc->in_sync_hint = pkg.in_sync_hint; | |
634 | ||
635 | return (int)pkg.is_recovering; | |
636 | } | |
637 | ||
638 | static struct dm_dirty_log_type _userspace_type = { | |
639 | .name = "userspace", | |
640 | .module = THIS_MODULE, | |
641 | .ctr = userspace_ctr, | |
642 | .dtr = userspace_dtr, | |
643 | .presuspend = userspace_presuspend, | |
644 | .postsuspend = userspace_postsuspend, | |
645 | .resume = userspace_resume, | |
646 | .get_region_size = userspace_get_region_size, | |
647 | .is_clean = userspace_is_clean, | |
648 | .in_sync = userspace_in_sync, | |
649 | .flush = userspace_flush, | |
650 | .mark_region = userspace_mark_region, | |
651 | .clear_region = userspace_clear_region, | |
652 | .get_resync_work = userspace_get_resync_work, | |
653 | .set_region_sync = userspace_set_region_sync, | |
654 | .get_sync_count = userspace_get_sync_count, | |
655 | .status = userspace_status, | |
656 | .is_remote_recovering = userspace_is_remote_recovering, | |
657 | }; | |
658 | ||
659 | static int __init userspace_dirty_log_init(void) | |
660 | { | |
661 | int r = 0; | |
662 | ||
663 | flush_entry_pool = mempool_create(100, flush_entry_alloc, | |
664 | flush_entry_free, NULL); | |
665 | ||
666 | if (!flush_entry_pool) { | |
667 | DMWARN("Unable to create flush_entry_pool: No memory."); | |
668 | return -ENOMEM; | |
669 | } | |
670 | ||
671 | r = dm_ulog_tfr_init(); | |
672 | if (r) { | |
673 | DMWARN("Unable to initialize userspace log communications"); | |
674 | mempool_destroy(flush_entry_pool); | |
675 | return r; | |
676 | } | |
677 | ||
678 | r = dm_dirty_log_type_register(&_userspace_type); | |
679 | if (r) { | |
680 | DMWARN("Couldn't register userspace dirty log type"); | |
681 | dm_ulog_tfr_exit(); | |
682 | mempool_destroy(flush_entry_pool); | |
683 | return r; | |
684 | } | |
685 | ||
686 | DMINFO("version 1.0.0 loaded"); | |
687 | return 0; | |
688 | } | |
689 | ||
690 | static void __exit userspace_dirty_log_exit(void) | |
691 | { | |
692 | dm_dirty_log_type_unregister(&_userspace_type); | |
693 | dm_ulog_tfr_exit(); | |
694 | mempool_destroy(flush_entry_pool); | |
695 | ||
696 | DMINFO("version 1.0.0 unloaded"); | |
697 | return; | |
698 | } | |
699 | ||
700 | module_init(userspace_dirty_log_init); | |
701 | module_exit(userspace_dirty_log_exit); | |
702 | ||
703 | MODULE_DESCRIPTION(DM_NAME " userspace dirty log link"); | |
704 | MODULE_AUTHOR("Jonathan Brassow <dm-devel@redhat.com>"); | |
705 | MODULE_LICENSE("GPL"); |